Feel free to use the links below to prepare for the SAT's

http://sat.collegeboard.com/practice/sat-question-of-the-day
CollegeBoard is the governing body that administers the SAT. This site has a question of the day for math that will track your progress as you prepare for the SAT. The question of the day is free, however there are options to take free online practice exams that are included if you register with the CollegeBoard (registration is free).


http://www.proprofs.com/sat/exams/practice-tests.shtml
This site is pretty cool. It lets you take 2 free tests and it even times you so that you can get a realistic idea of how well you know the material. In addition to the tests, there are lots of useful materials to explore and investigate (SAT wiki's, study guides etc). There are also multiple resources for the English and writing sections as well.

http://www.majortests.com/sat/problem-solving.php
This site has practice tests as well as test taking tips and an eight week Prep Plan